
Algebra of errors
I am very sorry if this is in the incorrect section!
After measurements, the following values and their uncertainties were recorded:
x = 8.3 ± 0.1 and y = 2.72 ± 0.07
Find the following values of Z
a) Z = x + y
b) Z = x  y
c) Z = xy
d) Z = x/y
e) Z = y/[(x)^0.5] (this is y divided by the square root of x)
f) Z = exp(y)
g) Z = ln(x + y)
h) tan(x/y)
My attempts: a) 11.02 ± 0.17 ; b) 5.4 ± 0.2 ; c) 22.576 ± 0.007 ; d) 3.1 ± 1.4 ; e) 0.94 ± 0.22 ; f) exp(2.72 ± 0.07) ; g) ln(11.02 ± 0.17) ; h) tan(3.1 ± 1.4)
Any help would be appreciative, I'm a bit rusty, having not done any physics in two years, and apparently, my attempts are all incorrect!

most likely, you need to pay attention to the number of significant digits.

Apparently it's more fundamental than that and he wont help me (my friend), very competative for some sad reason
